Pentacoordination at antimony in dibenzostibocines via D-Sb transannular interactions (DÂ =Â O, S): A structural study

The synthesis of the D(C6H4S)2SbS2CN(CH2R)2 (D = O, R = Me, 1; D = S, R = Me, 2; R = Ph, 3) complexes containing two different types of dithioligands is described. The antimony acceptor atom in complexes 1-3 expands its coordination number from three to five and displays a skew trapezoidal local geometry via an intramolecular transannular D → Sb interaction.